Diorama Controller Part 2 - Need More Outputs
I think I understood what you want. If you want to control more LED's with less pins, consider using a shift register. For example, sn74hc595 could increase your digital outputs drastically. It has 8 bits, so you can have 2^8 combinations of outputs with it! For example, 0000 0001 is something, and 0000 0010 is something else, and so on. Check it out! I hope this helps :)

https://learn.sparkfun.com/tutorials/shift-registers - Basic knowledge about shift registers
http://www.bc-robotics.com/datasheets/sn74hc595.pdf
Other shift registers are great as well