If you're looking for something frugal and artsy to do on Wednesday nights, consider taking the family to the New Orleans Museum of Art at City Park. Each Wednesday, the museum has extended hours until 8pm for their "Mid-Week in Mid-City" event, and thanks to a very generous donation from The Helis Foundation, admission is free for Louisiana residents (with proper ID).
Currently, there are a couple of exhibits that look like they might be particularly interesting for the older little ones, especially those with an interest in visual arts. Floatulents is an installation of photographic images by Martin von Haselberg. According to the NOMA website, the images are printed on glassine, stitched together, and inflated like bubbles. The Mind's Eye: Without Subject Matter, What Does the Artist See? is an exhibit of abstract prints and drawings, some of which remind me of my 4 year old's portfolio - in a good way!
Floatulents is on exhibit until September 6th, and you have until October 11th to enjoy the abstract display.