I'd like to see something interesting from an AGA core such as extended resolutions as mentioned, but also things like a speeded-up blitter and near-zero memory contention so that high-resolutions are snappy in high-colours.
128MB chipmem would certainly be interesting to see!
Does the board have USB connectivity, btw? I get the feeling that would be beyond the scope of the project :-(
BTW, I have some pulled 060s if you ever need any for testing, Mike ;-)