Here are my backgrounds for Medieval and Sports.
For Brick, I just went with namida's modification, a continuous wall:
For Medieval, I created a little landscape / scenery. This one is therefore more suitable for horizontal levels; actual L2 style levels with vertical scrolling should probably go with the classic purple background, since that's more in flavour for L2-style levels anyway
.
The Sports background is a little more random and abstract. It's probably still more suitable for horizontal levels due to the way the elements are placed and partly cut off towards the top and bottom edges. Also, be aware that the regular background for Sports is quite a bright shade of blue / purple, so your levels will look considerably darker when applying this background to them.
I've also added all the objects collected in this thread thus far to the graphic sets for the old format, in case anyone wants to use them there
. I know most people have moved to New Formats, so if no-one else is doing maintenance of the old graphic sets with these fancy new objects, I certainly will!