Here are some of my favorite anime endings. 

• Shunkan Sentimental - Full Metal Alchemist Brotherhood Ending 4

• Lets Go Together - Birdy The Mighty Decode Ending 1

• Himistsu Kichi - Eureka 7 Ending 1

• Style - Soul Eater Ending 2

• Hey! Smith! - Monster Musume (I couldn't find a good quality version of the actual ending itself.)

• The Real Folk Blues - Cowboy Bebop

• Shiny Shiny - Deadman Wonderland

• Brave Song - Angel Beats

• Don't Say Lazy! - K-On! Ending 1

• Lonely Person - Fairy Tail Ending 7

• Glory - One Piece Ending 7

• Watamote - Ending 1