Does anyone have any recommendations for a good insole for open toed footwear? I've got a couple of pairs of sandals that have annoying seams on the footbed that irritate my fussy feet. The footbed of another pair of sandals is just really dirty and looks gross, so I'd like to cover that up too. I'm looking for something thin and smooth that will stay in place and is not ugly- the normal cheap white foam drugstore ones are ugly and won't stay in place in sandals.