I have seen SO MANY people using or thinking of using a product called "Betta Hammock" Its basically a plasic leaf with a suction cup that you stick to the glass on your tank.
Just a word of warning. I have been reading on the web about these and some people have a problem with the metal wire part of the leaf being not properly sealed and rusting in their tank. This is DANGEROUS. I don't know if they have "updated" the product to fix this problem or not. If you have one take it out and inspect it for any signs of rusting (also pull the leaf from the suction cup and check there as thats were most of the rusting seems to occur). If it shows any signs of rusting DON'T USE IT! So just do regular checks on this thing or don't use it at all if you have it. Just something I wanted to share with you all.