for a change; for variety's sake
A set phrase used when suggesting or doing something different from the usual, often to add freshness or avoid monotony.
Let's have Italian for a change today.
For a change, why don't we go mountain climbing this weekend?
From 趣向 (しゅこう, 'plan' or 'idea') + を + 変えて (かえて, te-form of 変える 'to change'), literally 'changing the plan/approach'.