I do - I even do it for other people's fics sometimes. It just helps me visualize what's happening.
For Redraw the Lines, I imagined a darker haired version of Cole Hauser for Michael, and I can sometimes hear his voice when I read Michael's dialogue. For Cathy, I'd done a Google image search of James Rebhorn and found that he did a movie with Kristine Sutherland (from Buffy, among other things), so I often picture her. And I usually picture Kirsten Bell for Emma even though she looks nothing like Matt and primarily has blonde hair. There are some really cute pics of them together at events though, so I go with it. :)
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For Redraw the Lines, I imagined a darker haired version of Cole Hauser for Michael, and I can sometimes hear his voice when I read Michael's dialogue. For Cathy, I'd done a Google image search of James Rebhorn and found that he did a movie with Kristine Sutherland (from Buffy, among other things), so I often picture her. And I usually picture Kirsten Bell for Emma even though she looks nothing like Matt and primarily has blonde hair. There are some really cute pics of them together at events though, so I go with it. :)
It could work:
LOL