Here's a big and bold colouring page for the number 100. I had it in mind that it would make a good sign for a door or display, coloured in carefully in bright colours.
Here's a simple poster to put on display during your 100th birthday celebrations. I made sure that it wasn't too ink-needy! We have a colouring page version too, if you prefer.
The birthday candles on this colouring page spell out 100, so there is no doubt that it is a 100th birthday you'll be celebrating when you colour it in!