Hi, everybody! I haven't been submitting that many pictures to PUG myself, but I thought I'd share my idea about the themes. Sorry if this idea is a bit stereotypical (or even extremely so): Latin phrases. Personally I'd suggest to chose from the following:
ad hoc et cetera mea culpa cogito ergo sum (thou shalt not omit either "g" :-) ) magnum opus modus operandi nota bene status quo per aspera ad astra divide et impera (if you are not sure about the meaning of a particular expression, you can take a look e.g. here: http://en.wikipedia.org/wiki/List_of_Latin_phrases ) Igor