The following picture shows 20, 64*64 16bit sprites being (variable) Alpha Blended to the main frame buffer. Since PlayBASIC doesn't rely upon hardware manipulation, thus these types of effects must be performed in software directly to video memory. This is a slow and cumbersome process. However, if used sparingly these types of effects can really add extra level of quality to your programs..
Anyway, here's a shot.
2023 Note: This is obsolete today as you can write into FX image too keep the render in system memory, then copy the full frame into video memory when your done.
Sweet.