I'm really confused here, so not only have you made (an already) poorly rendered endcard, you've made it worse.
As above, never mind seeing inspiration elsewhere - the tools you have make a lot of the mocks, there are some free apps such as GIMP out there that can make quality stills quickly. The reality here is poor execution.
Try to work off grids, there used to be a safe areas guide (not sure if a new one for 16:9 safe working has been made by someone), work to those gridlines, be sensible about spacing and proportion. Don't throw a bad paint logo on something in Movie Maker. I would say 'can you see this on TV, but given current graphics on the BBC you'd probably stand a chance of saying yes
Oh it's such a perfect day, I'm glad I spent it with you...