I finally gave up on Aptana, which was just screwing up left and right. ...This means that I need to fall back to my old friend, Vim.
There's a script for calling gvim from a terminal, but I also wanted to change the color scheme on load (because my terminal is dark-on-light and my .vimrc colors are customized for that). To accomplish this, add to your .gvimrc:
colorscheme desert(Or whatever other scheme you care for.)
This was surprisingly difficult to find (why?!?), so... I hope you stumbled on this page before too much extra work. ; )