My thoughts, not really, well not an expensive one at least. I bought a cheapy one that sort of matched our theme. It's a wind up yourself one and tbh I don't think one whole wind (the maximum) stays on for very long. It looks nice though and for my own benefit (hehe) I do think it makes the cot look sweet. However, I've had much more success out of the Tomy light show...projects nice things on the ceiling and plays music at the same time. Can be set for 5 or 10 minutes. Dead cheap too, at the time I got it on Amazon for 7.99, I still check it out from time to time for friends who might be interested in one and it tends to vary upto around a tenner. Takes batteries but not had to replace them as the ten min short bursts must not use much. He's always asleep before it ends though!
ETA:https://www.amazon.co.uk/gp/product/B0013DE428/ref=noref?ie=UTF8&psc=1&s=baby this but can be in yellow or white too.