Decided I'm not THAT mad at Terraria and reloaded, started tinkering again using a Strong Password Generator site for 20-string seeds.
Found this one... large world, normal or expert doesn't matter, choosing Corruption will give you TWO world trees with tunnel roots AND a Living Loom just to the right of spawn, close enough that you can see both on one screen with a good resolution! (I use 1600x1024)
It also has two decent caves to explore just to the left. No surface Water Bolts, though.
If you use Thorium and choose Crimson, it puts one Crimson biome intruding heavily on the Aquatic Depths.
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Edit: A couple more from fiddling with the PW gen.
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Large, Normal, Crimson, starts you right next to a VERY useful item, if you're willing to risk drowning to get it. Head left, go jump in a pond!
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Large, Normal, Corruption, three world trees very close together immediately to the left, one has a root, and leads to a Living Loom.
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Large, Normal, Corruption, two world trees with roots VERY close to spawn, Living Loom, one root leads to a mine track into the Desert and a couple very handy new-character tools.