one option for you is to become an expert in something MacRuby.
One area for example that could give you some good skills and could be good for the MacRuby community (if you release the results) is the CoreAnimation area, an area I was hoping I would have time for but will not.
So:
1. You could take a look at the example I translated on
johnmacshea.org - in the Hillegas examples - Polynomials.
(He also has a book - available as a pdf at the pragprogs - if you are really keen do that as well).
You will probably need to buy the screencasts - and I actually have not checked with the PragProgs whether they are happy to have MacRuby versions of their Objective C code floating around.
I have done the macruby translations for the first two or three screencasts.
I am actually not sure what the performance would be in MacRuby - in the 4th instalment in that series Matt suggests that CoreAnimation (in ObjectiveC) can sometimes have performance issues with many layers.
If you are interested in following this path let me know and I will send you what I have done in the Bill Dudney screencasts. Even if we aren't allowed to release the macruby versions into the wild - you could learn from the process and help you on the next steps.
Cheers,
J