I chose an apple pie as my weapon. I applied a number of highlights, but kept only a few of them shown in this graphic.
This is what I learned from doing the challenge:
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Neither the strictly one-pixel width with empty corners, nor the continuous angled line with thicker corners, seemed to have the best overall effect; however, a combination of the two methods worked best in my opinion.
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I experimented with an extra-thick outline intended specifically for selection indication (as a green highlight). I was happy with the effect, but at the same time this thick outline would likely not be appropriate for any other purpose in the game (far too thick probably).
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I like the concept of the color-based outline. But, the potential disadvantage is that if the coloring of the graphic at any time changes, then the colored highlight also must change accordingly, which would create extra work that a single-color highlight would not require.