For DD, we have a tradition that she gets roses on her birthday. The number of roses she gets goes along with how old she is; for example this year she'll be 5 so she gets 5 roses. My dad did [and still does] this for my sister and I. We got our age in roses until we were 24 and now we get a dozen every year on our birthday.
I'd like to do something similar for DS but I'm stumped at what to do. I need something that will work no matter his age and that's reasonable enough to buy multiples of as he gets older. Any suggestions?