As far as "official" accessories go, I had the following:
- Premium Sunlight "White" Pearl colour option - (the standard black just didn't appeal to me)
- The standard Honda footwell "illumination" option - (it kind of turned out to be two trained fireflys giving their best effort)

- yet: I like the effect they provide!
- The dealership threw in orignial Honda floormats - (thank you!)
For "aftersales" accessories:
- I had all four sills laminated - (the official Honda offerings
don't cover the most exposed edges!)
- a
https://no.co/gb20 jump starter for the 12V battery - (just in case)
- a CTEK CT5 start / stop battery charger/maintainer - (the 12V battery is critical to the car!)
- a Promate 150psi portable air compressor - (it comes with a handy quick-release fastener - the screw-on types are just a pita!)
- an antiskid floormat for the boot - (you might even find one at Lidl)
- two cheap black neoprene computer mouse mats - (depending on your height, the dashboard reflects quite annoyingly in the windscreen)
- a 32 GB SanDisk "Ultra Fit" USB flash-drive for my music - (it is hardly noticable when plugged in - absolutely no chance to accidentally "knock" it!)
otherwise I felt no need to further "enhance" or "embellish" my Jazz (so far)

- (it's imho a quite remarkable and well equipped car!)
Addendum:
I forgot the "Auriol" thermo-hygro-meter from Lidl (they sold them in tree-packs) - (I just wanted to know, if the Jazz's climate control is up to the task - "surprise": In the long run it is!)