Here's a little lyric writing technique that can add a bit of magic if things become stale: simply add an extra word after the rhyming word at the end of the second line. This sort of tricks the brain because it anticipates the line ending on the rhyming word and when it doesn't u get a little "a-ha" moment. Pretty simple, but effective in practice. Because it does draw some attention 2 itself u don't want to be zealous with the technique, but used sparingly it's a staple of many great songwriters. Here's a random thrown 2gether line in case u need 2 c an example.
When it's all too late and the glasses start to clink
I've got too much time to think about