Having the sniffles and want a little relief? How about using an ice cube to do the trick! From Redditor rsharvey:
My solution is to drink very cold drinks while sucking an ice cube against the roof of my mouth. Blocked noses are caused largely by swollen blood vessels in your nasal cavity, so getting some ice near them will cause them to contract a little. Also I avoid hot drinks. They only make it worse. Which is annoying because a blocked nose is usually joined by a sore throat.
Does it work? We haven't tried it out yet but we'll be back to update if it works!

[Reddit]