Good old images generated (as a hobby) with the very first PC owned by my family, a 80386 clone at 25 MHz, with D.O.S, and an Oak Technology OTI067 graphics card with 512KB of DRAM. I used Turbo C and GKS (Graphical Kernel System, the first standard for Computer Graphics), with palettes and resolutions quite limited those years (around 1990-92).