Hello everyone, I've written a tutorial on how to have SVG files with more than 5 useable colours. Here's a link to my blog post with the instructions.
The very brief summary is:
1. Draw an empty guide box around the whole image.
2. Separate pieces of the SVG file onto different layers, no more than 5 per layer.
3. Export each layer + guide box as new asset.
4. Import all assets into Zazzle at the same time
5. Re-order layers to be the same order they were in Illustrator.
