I have a craving for ice cream right now.
PS:
You might also use these, as alternatives, in this situation:
-I really feel like some ice cream right now.
-I really could do with some ice cream right now.
( could do with sth: to need or want sth, also is used to express a mild wish in colloquial English)
( do with : would find useful or would like to have or do
"I could do with a cup of coffee")
hhttp://idioms.thefreedictionary.com/could+do+with
hhttp://www.usingenglish.com/reference/phrasal-verbs/could+do+with.html
Aspects of Modern English Usage: for advanced student, By Paul Lambotte, Harry Campbell, J. Potter, p 314-5