Circuit design/PCB design/Programing

I build and light, for display effect, model vehicle or buildings in the SciFi Genre. I want a circuit designed to use a programmable Pic Microcontroller. The basic circuit will flash as few as 4 but as many as 8 LEDs of any color so the PCB design must have a place for 8 LEDs but allow me to only use as few as 4 for any project. I want control of the speed the LEDs flash/chase and the duration they remain on during the flash/chase cycle. To reiterate, I want to end up with a PCB with gerber files I can have made at PCBWAY, that will allow me to use as few as 4 but as many as 8 LEDs of any color. I want to control the speed of flash/chase and the length of time each LED remains on during the flash/chase cycle. Possibly a selection of HEX files could be provided with speed and duration changes to choose from? I am open to options. Size is not critical although smaller is better. The LEDs will not be mounted on the PCB but remotely mounted out in a model so only wires running out to the LEDs will be attached to the PCB. I don’t want to have to deal with compressed files so please should we work together do not use a zip file program. Thanks.