You can make your own bracket/scalloped/flouris hed/framed/ornate/curved/ shaped squares simply by tracing the shape.
You can either find a template online, cut out your own (as seen on various blogs & or youtube) and or trace the shape from a single sheet of paper (which you can usually find over by the scalloped & shaped-type papers either here or at your LSS!)
I started out by buying one piece and then tracing it on to chipboard (back of a paper pack) adn then cutting it out to use a template. Once I got the cricut expression (only had personal at teh time), I cut them on there now!
I have a pazzles and wishblade but before I had a die cutter I'd hand trace them from a template and hand cut them. I used my fiskars fingertip blade but any one would work. The template I used was from an old sheet of diecuts, the leftover border works great for a template. =]
If you're not brave enough to trace & cut your own (or just don't feel like it) do a search on Etsy. Lots of sellers sell shapes they've made with a die cutting machine. I bought a stack of cardstock flourishes for about $2.00 + shipping - well worth every penny to me!