New fly tying season: what to work on?

The fly tying season started for me today. I haven't tied
a fly since April. But I did visit the ladies sewing store today,
where I bought scissors, thick claret-colored thread for ribbing,
various spools of metalic tinsel and a bunch of long thin
'beading' needles, which I tie most of my fly bodies on these
days. This weekend I'll drive down to West Yellowstone and get
a bunch of bird skins for tying soft hackles.

And I find myself wondering: what should I work on this year?
I still tie lots of standard patterns, but like many of us, I do
like working on new designs most of all. So what do you think the
most important,
still-outstanding and unresolved design problems are?
What the most important fish foods that don't have a satisfactory
imitation yet? If you could close your eyes and say the magic words,
presto, what would you like to see in the fly bins next year?