A is for (whoever gets Z starts the next theme)

[twyngwyn]

Grows on a tree

A is for Almond

[nicnacs_4u]

X ??

Y is for Yellow Cab

[twyngwyn]

Z is for Zeppelin 

new theme: Places named after people

A is for Adelaide

[countessalmirena]

B is for Babek

[twyngwyn]

C is for Charlottesville 

[countessalmirena]

D is for Dorotheenstadt

[twyngwyn]

E is for Elizabeth 

[countessalmirena]

F is for Fremantle

[twyngwyn]

G is for Georgetown

[mytreechange]

H is for Hobart

[twyngwyn]

I is for Islwyn