Mine what? There is 0 profit. A better solution would be to hang the cards on the wall for decoration.
It's funny that you say to hang a GPU at a wall because I actually have done this.
However I only did it because I couldn't sell the GPU because it had stripped heads while doing a thermal paste swap job and it was one of the first GPUs I've ever bought for mining and used it for years and had a good history with it.
The GPU was a Radeon 6990. It was a beast of a GPU which could pull around 500Watts from a single card. Yes most people got rigs which use 500Watts that GPU could pull 500Watts alone. It even burned 100Watts on idle which is what most GPUs use these days while mining.
Why did I frame the GPU? Because it was one of the firsts and learnt a lot about cryptos and mining and Bitcoin in general. I actually mined Litecoin with it, then Darkcoin (now Dash), then Ethereum, then ZCash and last algo was XMR. So it had a good run and couldn't bear to get rid of it.