Use one's noodle, formally

• Picture in one's mind
• Cook up, so to speak
• Engage in brainstorming
• Use your noggin
• Form a conception
• Put some thought to
• Come up with a concept
• Picture internally

Wiktionary Word definitions in Wiktionary
Etymology 1 vb. 1 To apprehend in thought so as to fix and hold in the mind; to memorize. 2 To generate an ide Etymology 2 alt. (context metaphysics English) The actual existence supposed to correspond with an idea; the correlate in real existence to the ...