I found a floating pool light on discount that I snapped up for the quality panel that was in it, haven't built anything out of it because I already have the solar gadgets I need. The plan was to buy a second car charger for my cell phone and cut the tip off and wire it "directly" to the panel (adding any resistors and whatever) to make a pocket size phone charger.

Since I already have two solar panels and one or more dynamo gadgets able to charge the phone the frugal side of me won't spend the money, but good luck to you, and let us know what works out.