I use Trello a lot. The free version is fine for me. The only non-free feature I want would be to set the background image to a custom one. But no way in hell w

I use Trello a lot. The free version is fine for me. The only non-free feature I want would be to set the background image to a custom one. But no way in hell will I pay a subscription fee for that * . I wish I could just pay a one off fee for that one feature *I live with almost no income, but almost no expenses either. So I only need to work when my money is getting low, and otherwise can just do what I want. A constant subscription type expense that constantly drains my money is something I avoid. eg I have a 'pay as you go' mobile phone contract.