Possible sentiments for "Barrels of Fun".

#1 - "Let the good times roll."

#2 - "Come on over for a barrel of fun!"

#3 - "You're on a roll! Keep it up!"

And, of course, the standards:
#A - Get Well
#B - Happy Birthday
#C - Bon Voyage
#D - Thinking of You
#E - Thank You
#F - Miss You
#G - Good Luck
#H - Good Bye
#J - Sorry
#K - With Sympathy
#L - Keep in Touch
#M - Be Well