Meghan - I'm in the US, learning Welsh from the SSIW website. I have found that there are a number of non-traditional Welsh songs that are interesting to sing, especially the songs of Plethyn, and particularly those with the the lyrics of the Welsh poet, Myrrdin ap Dafydd. If you join Mudcat, there are a number of folks who can message you with ideas.
None of the books I have give Welsh words to Blodau, but I'm sure that you can find lots of helpful folks here.
Welsh is a great language to sing in because of the extra vowels.
Chris in Portland