Today I decided to have a play with a stamp I got ages ago and have never used. It's from OnyxXpressions (Lucid Dreams Ink). It's quite a large stamp and I had some trouble getting a good impression. After several tries I realised that the problem was me - I was putting too much pressure on the stamp and squidging it (technical term, lol). So I inked it up once more with Versafine Onyx Black and tried again, this time just using an even, light pressure and voila!
Edited addition (15.10)
Looking at this pic it's not as good as it could be. Honestly, the original stamped image looks better than this. This looks like a photo you take of the TV, all lines, and the image wasn't like that. Must improve my photography skills.