FLOW.Toastr
This Package converts the flow flashmessages into toastr messages.
http://codeseven.github.io/toastr/
To use it just provide jQuery in your template and use:
{namespace toastr=KayStrobach\Toastr\ViewHelpers}
<toastr:ToastrFlashMessages />
additionally you need the following in your header
<link href="{f:uri.resource(path:'Contrib/Toastr/toastr.css', package:'KayStrobach.Toastr')}" rel="stylesheet">
<script src="{f:uri.resource(path:'Contrib/Toastr/toastr.js', package:'KayStrobach.Toastr')}"></script>