Julia,
This is a great question!

The ladies have done a wonderful job of helping you already. So, I'll just pop-in to mention that in CTC we do watercolor painting along with the poetry of Robert Frost (doing one watercolor painting a week to correspond with the poem).

In RTR we do art appreciation in a CM-picture study way once each week in coordination with the artists we are studying in history. We also do
Looking at Pictures, which is a terrific overview of how to look at pictures and some art history along the way too.

Each of the guides from Preparing on up also has the kiddos sketching along with their history.
Just in case you're looking for other CM-style skills... I'll also mention the following:
In Rev2Rev we do a composer study and music appreciation study with Amy Pak's
Hands-on Composers Activity Pak which includes many audios of music and a full-blown lapbook along with the audio tour through the history of music with
The Story of Classical Music.
In Missions to Modern Marvels, we are doing an emphasis on nature journaling (with nature related classic poetry coordinating with the nature journaling) using Barry Stebbing's newest book
Nature Journaling and Sketching.
We also include poetry CM-style in every guide from Beyond through MTMM. Beyond and Bigger include poetry coordinated with the history readings. Preparing includes poetry from Robert Louis Stevenson (with creative writing lessons based on the poem each week). CTC includes poetry from Robert Frost coordinated with watercolor painting. RTR includes the poetry of Emily Dickinson. Rev2Rev includes history-related classic poetry. MTMM will include nature-related poetry of Wordsworth, Wadsworth, and Whitman.
Many of our guides include nature-related focuses using living books. We get the kiddos inspired to be bird-watching, leaf hunting, tree examining, insect and animal classifying, star-gazing, nature loving kiddos! Anyway, I just wanted to assure you that you'll find many of these areas well-covered within our guides.
Here's some links and a few notes on incorporating CM-style fine arts skills too. I'll mention that when I didn't have our HOD guides written yet that incorporated the fine arts, I used the products I'll mention below. We did one area per day each week. This isn't necessary, however for those who are wanting to do something like this I'll mention a few ideas.
Nature Study:
viewtopic.php?f=6&t=527
Composer Study/Music Appreciation: Color the Classics or the series of composer books by Zeezok Publishing with CD's
Art Appreciation: Smart About Art series (study one painting per week and read commentary with it) one artist per 12 week term (CM-style) Mary Cassatt is a great one to begin with, as is Renoir.
Poetry: (We also did this once weekly, but you wouldn't need to add it as there is plenty in our guides). We used the
Poetry for Young People series and did all of the poems for one poet at a pace of one poem per week. Then, we went on to the next poet. We really enjoyed Robert Louis Stevenson, Robert Frost, Emily Dickinson, and Henry Wadsworth Longfellow (hence their inclusion as featured poets in our guides)!
Blessings,
Carrie