I love decoden, but I am soooo lazy about it! I've had my pink XBox 360 controller ready for deco (i.e. I have all the gems and pearls stuck to it with poster tack) for almost 2 years.... and my headset has been in the same condition for, at least, 6 months.
The controller sits like that because I keep deciding it needs more pearls and sparkles, so I keep adding and then testing it to make sure it's not uncomfortable for me to use. The headset.... because I'm too lazy to go out and find a bit of lace to edge a little Hello Kitty cameo with...
Outside of that, I have a bunch of decoden style cupcake rings from Paradise Rose Shop, I can't skip an anime or gaming convention I'm attending (that they happen to be at) without buying at least one... usually to match my newest Lolita dress or skirt (as in Japanese street fashion, NOT Nabokov...). Along with those I also have a bunch of simpler decoden jewelry from various artist allies!