My daughter complained that she isn't able the hold the UNO playing cards in her hand, so I made here a stand, to put the cards in. The top is chamfered, to allow easy insertion of the cards and the whole stand is extra wide (28 cm/ 11″) to hold many cards.
I made also a bigger version because my daughter complained it couldn't hold enough UNO cards and wasn't stable enough for playing on the sofa.