I got myself some reserve tank covers to enhance my motor bay and installed them. in fact there is nohting to install since you just put them over. I did some research before getting mine and I noticed there were actually lots of covers available. What I noticed is that it's the most affordable way to start styling your engine bay. Here is a short list of covers I liked most. Feel free to complete this list:

Mugen reserve tank cover. Orange is the color... Great covers, looking good and doin their job: enhancing the engine bay:
seen at www.kingmotorsports.com 16$ (sold individually)

Spoon reserve tank cover. Also great covers available in blue with white stiched logo. Seen at www.bestJDMparts.com 19.95$ (sold 2 as a pair)
 

Skunk2 covers. This one is known as break tank cover and therefore is a bit larger than the usual reserve tank covers. Available in black only and seen at www.skunk2.com for 10$ (sold individually)
 

PasswordJDM. Got bored of Mugen and Spoon parts? Don't want to get yourself a non-badged aftermarket cover? Then get the PasswordJDM covers. Looking good and a must have. Seen at www.passwordjdm.com for 12.99$ (sold 2 as a pair)

great that but I would go for the passwordjdm covers. Everyone has mugen now so i got bored watching the cars having anything about mugen

check your local sporting goods store, you can probably grab some ofthe exact same things and get em embroidered with whatever you want on them... just a thought

That's also an idea, but the price is the same. I had the idea with the code:JDM logo they wanted about 20€ which is about 30 $ I think. So I prefer to order them online. Shipping costs are not that high.