Well actually this is my favourite picture to compare sizes. I printed this and hung it on my son's wall when he was 7 years old.
http://onlyfunnyjokes.com/bestofthew...comparison.jpg
And this is a good one for star comparisons.
http://www.funmint.com/images/planet...s-arcturus.jpg
I know that you're looking for relative sizes in a scope, but thought this may be of interest.
cheers
Rod