As Vinoth says, you can use CSS classes to change the appearance of error messages. In addition to this, Stripes posts can be fully customized by editing StripesResources.properties
.
Here you can determine exactly what your posts will look like using markup and CSS classes, or even inline styles.
# Resource strings used by the <stripes:errors> tag when there are no nested tags stripes.errors.header=<div class="my-error-wrapper"><h4>Ooops... some things went awfully awry:/h4><ol> stripes.errors.beforeError=<li><i class="fa fa-warning"></i> stripes.errors.afterError=</li> stripes.errors.footer=</ol></div> # Resource strings used by the <stripes:errors> tag when displaying errors for a # specific field (eg <stripes:errors field="password"/>). If not supplied the # values above will be used instead. stripes.fieldErrors.header= stripes.fieldErrors.beforeError=<span class="my-error-inline"><i class="fa fa-warning"></i> stripes.fieldErrors.afterError=</span> stripes.fieldErrors.footer= # Resource strings used by the stripes:messages tag stripes.messages.header=<div class="my-message-wrapper"><ul> stripes.messages.beforeMessage=<li> stripes.messages.afterMessage=</li> stripes.messages.footer=</ul></div>
As you can see, you can add extra fancy stuff like FontAwesome badges (admittedly this goes a little further than the OP asks for).
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