Does it look weird to stack a 6" round on top of a 10" round? (4 inches high each). I've done it before but last time I did it I had flowers all over it so it looked good. I'm not putting any large things on this cake.
I don't think it looks weird. It is a normal combination just as graduated sizes of a one inch, two or three inch variance all look fine too.
Depends on the look you are going for... here's a 10 and 6 in dummy form. (Forgive the mess - gotta love toddlers in the office!)
I tried to post a photo of stacked 10 and 6" dummies, but it wouldn't attach to my post. I sent you a PM.