In order to rectify the problem, I think the first step should be to eliminate some suggestions.
So firstly I'm going to ask:
Is anyone is willing to withdraw one of their ideas?
Since I'm the one suggesting this, I'm happy to withdraw some of my suggestions:
That brings us down to 28.
I'm also going to ask
Is anyone willing to merge their ideas?
Again, since I'm the one suggesting this, I'm going to do that for two of my ideas.
I'm going to merge Historic Buildings and Antiques into History.
That brings us down to 27.
I'm going to make an executive decision to decline the 'Famous Paint(ings)' suggestion.
I'm going to rule that as originality is an important factor, 'Famous Paint(ings)' is too likely to tempt people to just copy a famous painting without altering it.
(Not to mention the potential copyright issues and temptation to cheat by scaling down a photo and reducing the image to 16 colours using software.)
That brings us down to 26