Flame saves more than just the seed information, so you can edit the parameters of the seed when you reload it later. Flame makes use of a colormap for its coloration. The colormap can be specified using a menu option and can be one of a number of predefined options, a custom gradient or a background image. QBist I just like to play with to generate interesting backgrounds. QBist does a better job of automatically scaling the form to fit your image area.
Flame requires user input to handle the scaling.
So that's it. The Gimp has been a real joy for me. I've been able to learn quite a bit about computer graphics from a technical standpoint because of it. Using and combining the filters available for the Gimp is an art, one that doesn't follow any style guidelines or defined standards. Mastering the Gimp requires both an understanding of the technical and an openness to the visual.