I use a 3ftx2ft textured plastic writing mat, like those they have in banks.
Ive used them as mats ever since laser mice have been available.
I find they grey and black ones best.
The texuring is very fine on these and they are foam backed too so they work well as a mouse mat for anything i can think of.
Ill try to find a link for them.
PC:
ASUS RIIE // Intel i7 920 D0 4.4Ghz 1.375v //
OCZ Reaper 1800 C8 // Sapphire 5970 1Ghz x2 //
Intel X25-M G2 80GB RAID0 // BeQuiet DPP 1200w //
Seagate 500GB 32mb 7200 // LG BR //
Cooling:
TFC Monsta 6xSharkoon 1200rpm 140mm //
HWL GTX480 4xScythe Ultra Kaze 2000rpm //
EK Supreme LT // EK FC-5970 // XSPC RS120 //
Laing DDC1 3.2 x2 // XSPC Res-tops // KL QDCs