As of the October release it is possible to embed shared google documents in your glow blog by pasting the url to the document into a separate line in the post editor:
The Document below was embedded by simply pasting the url into the editor. The document needs to be published to the web in Google docs first (see below)
You can embed photos stored in google Drive by pasting the sharabel URL (see below for details)
After sharing a google sheet you can embed it in a Glow blog post and page by pasting in the share URL.
After sharing a google presentation you can embed it in a Glow blog post and page by pasting in the share URL. To embed, in the Sheets editor choose Share from the File menu. In the ensuing dialogue click Get Shareable Link. Past that link into your blog editor. Google Embed Examples
Unlike most of the other embeds Google calendars need you to activate the Google Calendar plugin and use the embed code. More details on the Google Calendar Embed page. See all the Google Embed Examples.