3D Stitches for Tunisian Crochet

Limpet Shell Pattern for TC
I found this in a reproduction of a Victorian Crochet book; it's a Popcorn variation for Tunisian crochet.
I worked this little Popcorn with a Tss or Afghan st, as the background sts.
Any number of stitches + 2 extra for the edges.
Work 2 or 3 rows of Tss as a background for the design pattern.

To form the Limpet Shell Pattern:
On the FORWARD of a row, work the number of Tss up to where you want the Limpet Shell.
(*Now, you are going to form a loop in the yarn by bending the forefinger of your Yarn hand over the yarn connected to the rest of the sts.  Bend the finger all the way closed.   
You will see the top of the loop between the first and second knuckle, while the bottom of the loop is held tightly in the folds of the first joint of your forefinger.
Place your hook on the second knuckle of your forefinger. Slide the hook towards your fingernail, and then under the yarn. Once the yarn is on the hook, slide the loop off the end of your finger.  Now pull on the yarn to tighten the loop onto the hook.  This is known as a Half Hitch Knot.
Now slip the yarn back onto your forefinger like you normally would.
Repeat from the * 7 more times.  
They will look similar to this _|_|_|_|_|_|_|_| on your hook.
With 8 Half Hitch Knots on your hook, yo, and pull through all HHKs AND the Tss at the beginning of the HHK string.  This forms the Limpet Shell.)

Continue working Tss to the next placement of a Limpet Shell and Repeat the process between the (  ).

ON THE RETURN: You work the sts off as you normally would for Tss.
TIP: To make this advanced stitch easier to work, I leave the Limpet Shells on the BACK of the piece until I*m finished.  Then I push them through to the front of the piece.
Tension is critical with this Shell; if the HHKs are too loose, the shell looks funny; too tight, and it is almost impossible to get the hook through the center of the HHKs.

TC Pebbles
Tunisian Crochet Pebbles are slightly smaller and less bulky than a popcorn or a bobble.

I recommend using a Tunisian Simple Stitch (Afghan st.), since it is easier to slip the hook under the vertical thread of the st, rather than going all the way through the stitch to the back (Tks), when working with the pebbles.

The actual pebble is formed- on the Return of each row- by adding 3 Chs between the stitches.

Placement of the Pebbles is at your discretion.  This pattern was achieved using a Checkerboard pattern.

Basic instructions:
Work Chs to desired length.
Rows 1 & 2 Forward and Return: As you normally would for Tss (afghan st.)
Row 3 Forward: Work Tss as you normally would across piece.
Row 3 Return: Yo, Pull through 1 loop,* yo, pull through 2 loops.( Repeat from * up to Pebble Placement). Ch 3, Yo, pull through 2 loops. Repeat instructions from* across row.
Repeat Row 3 Forward and Return to complete pattern, or place pebbles to create other 3 dimensional patterns.
If you want a solid Pebble texture (as seen in the photograph) I prefer to push Pebbles to back of piece. This helps the whole piece to lie flat.

Push the Pebbles to the front of the piece to achieve a desired pattern such as hearts, diamonds, or argyle criss cross.
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For a diagram of all the various Threads of a Tunisian Crochet Stitch,
Click Here!
You can find photos of these stitches in  Encyclopedia of Tunisian Crochet!
Beg: Beginning
 Ch: Chain stitch   
Lp: Loop  
Hk: Hook
DO: drop off
PU: pick up
Sk: skip stitches
Sl St: slip stitch
Yo: Yarn Over hook
Tks-Knit st  
Tss-Simple/Afghan St Tps-Purl St
 Trs-Reverse St
 Tfs-Full/Plain St

Trps-Reverse Purl st