Not exactly an answer to the quoting/escaping problem of the original question but probably something that would actually have been more useful for the op:
unset FILES
for f in 2011-*.jpg; do FILES+=($f"$f"); done
echo $"${FILES[@]}"
Where of course the expression would have to be adopted to the specific requirement (e.g. *.jpg
for all or 2001-09-11-*11*.jpg
for only the pictures of a certain day).