There was a competition announced on forum.warsztat.gd in making a 4k executable graphics. In case you don't know what is it: It is a category well known on demoscene where you have to write a program - Windows executable in assembler, C, C++, Java, HTML or any other language, that fits into 4 KB size limit and generates a static, nice looking image. Obviously there is no way to store a bitmap inside such size, so the graphics must be generated procedurally. For list best prods in this category, see this search query on pouet.net.
I participated in this competition and here is my entry with source code: gfx_4k_Reg.zip. EXE file itself has 1259 bytes. Archive has password "demoscene" (needed because server of my hosting company rejects archives containing unusual EXE files like this, thinking it is a virus :)
Not very impressive, but keep in mind that I coded it in about 2-3 hours, with little previous experience in this kind of coding. If you are interested in how such program is made, I used: