Most everywhere. Some painted pineapples on the living room wall above the piano, several on stands in that room (U-bass, tenor, 8-string, a soprano, banjolele, and whatever other one happens to be out lately. Flea and Fluke next to the TV in the family room, a smiley on the wall and an imitation Flea on the dresser in the kids room, one or two in my office on stands, and a couple in cases (central California, not a real humidity problem).
I bought a bunch of the Eddy Finn folding ~$10 uke stands a while back, and am glad I did, as the ukes in cases don't get played nearly as much...I like having them ready to grab and play, and when someone comes over that plays, they're likely to just pick one up and play a bit, which would be unlikely if it were in a case. A Roland bass cube and a Vox Mini 3, both battery-powered, sit next to them for easy use any time we want to plug one in, a must for the U-bass at least, and the Roland can add a nice drum rhythm at the punch of a button.