I found following images suitable for menu-background.jpg I think.
http://safebooru.donmai.us/posts/2368329
http://safebooru.donmai.us/posts/2346117
http://safebooru.donmai.us/posts/2341987
http://safebooru.donmai.us/posts/2330346
(if the links aren't ok, please tell me and I'll re-host the images to imgur)
Also, do you think the yellow cursor is fitting for the hit circles? I would have chosen a different color, but of course that's up to you, I can change it on my end and let you know about it.
http://safebooru.donmai.us/posts/2368329
http://safebooru.donmai.us/posts/2346117
http://safebooru.donmai.us/posts/2341987
http://safebooru.donmai.us/posts/2330346
(if the links aren't ok, please tell me and I'll re-host the images to imgur)
Also, do you think the yellow cursor is fitting for the hit circles? I would have chosen a different color, but of course that's up to you, I can change it on my end and let you know about it.