There are an abundance of synonyms that can be used in place of "great idea." Synonym options include "brilliant concept," "amazing plan," "outstanding notion," "excellent proposal," "remarkable scheme," "fantastic brainstorm," and "terrific innovation," among many others. These synonyms can help provide more descriptive language and can help to elevate the enthusiasm and excitement surrounding the idea being discussed. It's important to choose words that accurately match the tone and significance of the idea being conveyed, as well as the intended audience. Regardless of the synonym, the overall message is the same - this idea is exceptional and deserving of attention.