Here's my lame attempt at the chords for Jar Of Cardinals (someone requested them awhile ago). The same thing gets played throughout, it's just a three-chord progression that goes to another key for the next three chords (I think). G G* Em C C* Am
The G is a standard 3rd fret barre, the rest are the standard open chords. The C* chord is just x20010 (according to a book I have this is a G6 (B bass C added) but I just call it C*). The G* is the same thing as the C* on the 7th fret, but to play it at the 3rd fret like it's supposed to be, I think it's like this x34433. You can walk the bass down from the G to the G* as 3--2 with your thumb on the E string, but my thumb isn't big enough to get that F# (I think the bass takes care of it on the album). This probably isn't exactly right, and you can substitute a Bm for the G*, though it sounds a little off.
Jar Of Cardinals by Guided By Voices guitar chords playing instructions.