Honestly, the thing I was going to suggest you already mentioned: grouping pages by colour. Otherwise known as, anything, so long as it's green :)
Also, you said another great one with sorting by layout, because my second criteria would be "I only want two columns, main body and sidebar, and I want the sidebar on the right". Obviously ymmv with this one, but separating by layout would be helpful to me.
Also, this probably isn't the best way of describing it, but how about a "feel" category of "things that look like they could be other things"? It's probably easier by examples: this category would contain ones that look like an actual notebook, or a pinboard, a chalkboard, a typewriter, a mobile phone screen... a banana leaf, a cavepainting! But all those sorts of things together, if you have those sorts of things. Those are the other kinds of things I'd look for, if I wanted a change from green.
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Also, you said another great one with sorting by layout, because my second criteria would be "I only want two columns, main body and sidebar, and I want the sidebar on the right". Obviously ymmv with this one, but separating by layout would be helpful to me.
Also, this probably isn't the best way of describing it, but how about a "feel" category of "things that look like they could be other things"? It's probably easier by examples: this category would contain ones that look like an actual notebook, or a pinboard, a chalkboard, a typewriter, a mobile phone screen... a banana leaf, a cavepainting! But all those sorts of things together, if you have those sorts of things. Those are the other kinds of things I'd look for, if I wanted a change from green.