oh yeah, I like that mouse pattern & Doug, I'm really diggin' that pike fly!
Here's my latest iteration (e.g. tinkering with stuff that doesn't really need much tinkering) of my super simple baitfish pattern. I've got it down to 3 materials and with the dubbed head, that gives me some really nice subtle movement but with the stiffer tail (bucktail), I get a more consistent action I'm after with these little ~4" flies (kinda like a glide/jerk bait which works really well and it's my preferred way of fishing for bass). There's some grey pearl estaz for the body...it subtly comes out in the water, but probably not even necessary).
I fish almost exclusively white. Occasionally, I have fished the chartreuse (and of course, chartreuse works) but haven't ever fished any of these other colors, just wanted to add a little something extra. Oh, I also have done up a black/purple that has a few fish on it as well.
Edit: here are few more popping off my vise recently...
brightened up that top for a touch more visibility (to me)
Even in clear water, when you're sitting down, it's nice to have a touch of extra visibility to see the fly. Plus, it still retains that [mostly] black from below.