This is realy an DIY mod for my Zalman Z11.
As im working at printworks ( making book covers out of cardboard sheets), i took some leftovers from one of papers used to books.
So, list of things used:
doblesided tape, printed cover.
I spent 3 days as there was nothing to hurry.
The front cover, untouched. As I finded out the grill in front is removable.
Materials used in my mod. the paper used here is not usual one, but i think usual paper can be used as well. Why doblesided tape?? I tried glue, but it made the material to make "waves"
Upper cover in procces. And my Litle Helper as well 
Front cover almost done. thrue all i needed to think how to cut and bend material, as cover isnt square shape 
Front cover again.
Almost there ... side intake is already done.
Here i made some upgrades and mods to case itself. First i covered uper fan mounts, as i dont use them. Next i made the optical drive bay as intake fan mount.
So, the final result. Its not perfect, some not so good cuts there and here and so on, but im satisfied.
The idea was to show that from some usual "in house" stuff u can make something interesting.
Hope u like it, and this is just and first stage.have some ideas in mind but first i need to make some researc at locak store.
Peace out, and im open to sugestions or something ...
P.S. sory for my english, its a long time since i wrote something 