This is my favorite time of year on the local tailwater. It's stereotype (well earned) is that 7x and #26's may be a bit big... But this time of year - even in July - chucking #6-#12 hoppers or similar giant foam and rubber flies is fun. Hope to get out and fish these tomorrow.
The top is the style I've most fished outside of a standard Chernobyl antesque versions. The bottom is a "Morrish Hopper" which I'm playing with.
If you fish small fly tail waters, consider going the opposite way some times. It's lot of fun and can result in great catching. Plus, the shock on people's faces when you show them a fly about 15X bigger than theirs is fun!