'free idea' is correct and usable in written English.
It can be used to refer to an idea that is not bound by any rules or restrictions. For example, "I came up with a free idea for a new project."
"They are expecting to be sold something, but what they come away with is a free idea".
(Free idea: "White House Down II: White House Double Down").
If not, well, consider this a free idea.
Check out a free idea gallery booklet to get just a taste of what's possible.
To assist with decorating projects, Krylon offers a free idea booklet to get you going.
I have a free idea for Black History Month, if she's interested.
Herewith, some free ideas for "Idol" producers on how to improve the show before a judge ever lays eyes on a contestant.
Free thought, free ideas, artistic efforts and most of all a great sense of free imagination cannot be destroyed or eliminated," she said.
We should welcome those with pro-Palestinian, anti-Israeli policy bias as a counterbalance adding to the marketplace of free ideas.
Companies get fresh, new and most of all free ideas.
While MSU is not a sponsor of the creation summit, MSU is a marketplace of free ideas". .
