I made this for my lovely boyfriend:
Saw some on etsy =tags&includes=title]here. Told myself I could easily do it
Mine is actually way simpler then hers; All I did was cut the right size according to the cardboard cup I had on hands (a small btw). I blanket stitched the side with brown threat and I embroidered this image found out of google. It really pleased my geeky lover!
As for the Velcro, it has sticky back, so no need to sew!