The following are themes available for the Sony Ericsson P1i of which you must pay for. Premium themes are generally of a higher quality and feature continued developer theme support, sometimes.
No premium themes have been added. Suggest one!
Free, as in, click, download, transfer, apply. It’s that simple, if you need help read How do I send downloaded themes to my phone and apply them? or ask a question on the P1i Forum.
Below are a few of my favourite themes for the Sony Ericsson P1i, some are external links other are hosted here. If you have found better themes let me know!