This takes an image that was created, shows it and deletes it.  This is good for captcha images since you dont want to keep them arround after they are created.

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<img src="/blog/serveCaptcha.cfm?captchaImage=<cfoutput>#captcha.image#</cfoutput>" border=1>

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This page feeds back the image and deletes it after

<cfparam name="captchaImage">
<cfcontent deletefile="yes" file="#application.blogcfm.captchaImageRoot##application.blogcfm.dirsep##captchaImage#" type="image/x-png">

Serve Create image through IMG

ColdFusion