There are LOTS of apps about spots and dots and circles. Here are a few of my favorites that we explored during the December Supper Club:
David Weisner’s SPOT (I actually didn't get a chance to demonstrate this one, but it's a unique title with a very intriguing interface!)
(based on the excellent and nearly app-like Press Here book)
We also made these great dotty garlands (or necklaces) with office supply round stickers and some thin string.