there's a couple things i'd like to suggest
(i apologize if i parrot anything anyone else said without realizing it )

1. themes!!
i know a few sites that offer different overlays/vistas/themes (whatever they label it as) that change site graphics and colors to different provided presets. they're usually holiday themed, but sometimes they're just fun or seem relatively standard (like how it might be nice for this site to have a dark theme?)
i also remember there was one site that i used to frequent that gave you the ability to make a totally custom theme just through custom coding! but of course that's probably a little too much to ask for the moment ^^;
heck! even just the ability to customize the colors of the site with a custom layout option would be great! i mean. i love orange and blue, but i'd still love the option to change things to something else at my leisure.

2. ability to change font size!
some of the text looks awfully small sometimes... this just seems like an essential thing to have, especially since zooming in just destroys the quality of images!

3. expand the size of the main body of the site?
(or at least make the forum posts wider)
with my own username, the sidebar being so skinny segments it very awkwardly at the end and that's honestly a little uncomfortable... plus i'm just not used to such short forum post boxes! even just changing the way which posts in a thread are viewed would allow for much wider posts, sidebars, and even signatures!
the site layout in general could probably be better if some things were moved around or resized, honestly, but i'm no web designer and i know there's still a lot of work being done-