Man, I don't know about that thing...it looks like an aftermarket distributor's warehouse exploded all over that truck. lol.
I was all about the "hey, look at me!!!" mods when I was younger, but I prefer a more under stated/stockish look these days.
The word that comes to mind is "Festooned"
fes·toon
fesˈto͞on/
verb
past tense: festooned; past participle: festooned
1.
adorn (a place) with ribbons, garlands, or other decorations.
"the room was festooned with balloons and streamers"
synonyms: decorate, adorn, ornament, trim, deck (out), hang, loop, drape, swathe, garland, wreathe, bedeck; More
Origin
mid 17th cent.: from French feston, from Italian festone ‘festal ornament,’ from festum ‘feast.’