Wavelets in Photoshop
If you have Photoshop (or a compatible program which accept Photoshop plugins), I have written a wavelet tutorial using Photoshop. It was originally aimed at students in a multimedia school with limited mathematical background.
The tutorial implements a simple Haar decomposition/reconstruction using a programmable Photoshop filter. It ends with a glimpse of nonlinear approximation. All of this is done within Photoshop with 8-bit arithmetics.