I seem to remember the pictos came with the normal sencha 1 or 2 package. Here's a screen shot of where they are located on one of my architect projects, if that helps. Screen shot 2012-05-18 at 08.17.56.jpg
You need to include them via SASS css and run compass watch on the yourcss.scss file via a command line to watch for changes and recompile it. You can also add your own designs and specifically reference them too.
You also have to include the compiled css file in architect in the resources.
I just read the above and it sounds total gobbledegook, but I hope it points you in the right direction!
UPDATE: If a project is created with SDK Tools Beta 3 (command line), it creates the correct project structure that includes a sdk folder that contains the pictos icons, config.rb files, compass scss files, and a lot more. There are some inconsistencies between the SDK and Architect 2 at the moment - but getting much closer to prime time.
For sure, many people understand it better when they see it, not just read about it. It would be great to facilitate more example projects by increasing the max file size that can be uploaded for zips or project archives.
Download the latest Sencha Touch 2.0.x (not the Architect)
Open the zipped directory somewhere you'll remember. I put it in the Program Files (x86) folder - because I have administrator privileges
Download and install the Sencha SDK Tools and test the installation according to the docs Here [TBD fill this in]
Download Ruby from [here] // latest version works fine
Download SASS from [here] // read the docs while at it
and then install compass from [here]
or did I forget something.
Download Scout UI or don't download Scout UI, do this or that...
Now if you want the phonecall icon do this and that. [TBD]
First find the icon in the icons folder of the Sencha Touch package. C:\Program Files (x86)\sencha-touch-2.0.0-commercial\resources\themes\images\default\pictos