Disclaimer: I am no writer, blogger and hence the post might sound a little boring. Suggestions are welcomed.
This DIY (Lights & Sound) revolves around doing custom lighting in boot space & cabin and reducing rattling sound due to components that commonly keep hitting against each other due to vibrations.
Though these are based on Honda Jazz facelift model (mine is Dec-2013) I believe it can be used with any car with similar situation. I prefer keeping the car in stock condition and avoid cutting / drilling any holes. This helps to restore the car to original condition without any damage in case the DIY fails.
Hope this helps. I am going to let the pictures do the talking as much as possible.
Lights:
The Jazz story- Those of us who bought the facelift version of Jazz got some really helpful features like USB-in for audio and Boot lamp. Though the boot lamp is helpful as a feature the one that is there on the Jazz is hardly of any use (and so is the case with mostly all the hatches) mainly due to it's location which is typically towards some side/ corner. It provides very little illumination and casts shadows while the boot is filled with luggage. Hence it is of hardly any use.
This is how it looks before the extra lights are added.
What you need is an LED strip. This can be procured from any electric/ hardware stores (at least in Mumbai) and comes in rolls of 5m.
I prefer warm or warm-white LEDs over the bright white.
Ensure to buy a set of connectors. This will help you to easily separate out the setup when you need to remove the parcel shelf.
If your parcel shelf opens up when you open the hatch door stick the LED strip on the inside of the lip else stick it on the bottom of the shelf. I found that having a strip that is 60-70% of the width of the boot is sufficient for good illumination. The LED strip comes with 3M adhesive and sticks pretty well.
When you stick the LED strip on the shelf ensure to secure the endpoints using electric tape.
Ensure you cut the strip on the dotted line shown. You will need to do a careful job of soldering the wires on the two contact points to ensure that the solder from one point does not spill over the other. Sorry I do not have a photo of this.
The Jazz (yes I like to call it The Jazz sometimes out of respect

) )has the light on the left top corner and does poor job of illuminating the boot. I have used the existing light as the source for power. Also it is synced with the boot opening & closing mechanism so is ideal to control the switching of the LEDs.
I have connected the two wires (+ve & -ve) to the existing two leads by simply jamming them in the space available.
Now attach the wires to the one end of connector seen in earlier image. Carefully mount back the light and the original casing with the wires dangling out. Ensure the wire sleeve/cover is not sliced off while mounting the case back.
Attach the two ends of the connector of the wires coming from LED & source.
After Illumination...
You can also replace the cabin lights completely using LEDs available on ebay/ amazon. These come with spring loaded connectors that fit into any sockets.
I know using LEDs does not really save power as they are ON for very little duration, but consider when you accidentally leave them ON and lock your car they don't drain your battery too much.
Sound:
Lot of us are finicky about even a small rattle coming from our cars...at least I am. So here are some ways to reduce that. Some of the common areas are as follows:
Where you parcel shelf comes in contact with the car body. Place some cushioning foam tape so that the parcel shelf does not come in direct contact of the body.
Also where your hatch door plastic cladding comes in contact with the parcel shelf. Typically manufacturers do provide some rubber pads but still the shelf vibrates and keeps hitting on the hatch door. I am a fan of welcrow (also Velcrow) since it allows for removable adhesion, without loosing the adhesive power over period of use.
You can apply either of the end on either side. I have applied one end on the hatch lip that comes in contact with small portion of the hatch door. Let the pictures do the talking.
Other places of rattle are....
Where your folding seats' backs get mounted. Apply generous foam tape on the metal brackets.
The space near spare wheel where you keep tools, bottle of water, etc. I prefer to jam them using cloth which works very well to dampen motion and hence vibrations.
The boot cover (one that covers the area over spare wheel) also keeps flapping and jumping when there is no luggage. Consider using welcrow at the point where you pull the cover (on both the cover side and the lip of body where it sits). Do not apply welcrow across complete length as it may become very difficult to lift up the cover.
Thank you for your patience if you are still with me.
MODs I could not find a similar thread on Honda Jazz hence posting it separately, please merge with other thread if relevant.