How about a
[blocks]
<set{ length }to(
and a
<set{ width }to(
[/blocks]
block. I saw a question about stretching and I got this idea. And those blocks weren't meant to be variables. It's the only thing I could use for a module. And how about you measure the size in pixels instead of percentage.
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Maybe different colors. I could only find the color options for variables (I am a novice hacker):
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