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So I've been tinkering with Zulah's Easy GUI
package, which makes it really easy to customize your layout and add artistic elements to it. This is something I wouldn't have bothered trying in the past.
While I still need to make some adjustments with lining everything up, here's my tinker attempt at 5:30am after getting off of work, just to see if I could fill the background out.
There's a lot of room on the sides, so may turn the Afflictions and Elixer boxes (bottom right) off and add art to each side. Just a matter of deciding what. Either way, certainly spruces up the bland Mudlet window.