I'm rather late posting this.. my April project has sneaked into May!  Tell you why soon..
I decided to keep my alpaca projects reasonably simple.. since I'm using raw fleece that I have to sort and card I just didn't have the time for preparing enough for a bag or slippers or whatever.  I have felted a seamless hat in the past and will put a photo at the bottom of this post.. but I don't have shrinkage details. 
ANYway, I decided to make a couple of flat pieces that can be used as table runners.
Both have a design inspired by Nordic petroglyphs.  The first one is white leg and neck fibre, coarser than the saddle area.
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Design 'drawn' in red merino fibre directly onto the bubble wrap  - using the back/non-bubble side up.  I  only added the main elements at this point. | 
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| Brushing tufts of fibre.. but end first then tips | 
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Laying tufts out.. this will be the right side.  Placed tufts all around the outside then filled in the centre | 
And I forgot to take a picture of the next bit :S  I laid 2 perpendicular, very fine layers of carded fibre over the tufts.  I peeled layers off the batts and placed them 'as is'.   From the couple of alpaca projects I have done in the past I found that it was very difficult to heal a cut edge, so decided to make make a feature of natural edges.  I left a border of tuffs extending past the batt layers to form a fringe. 
Part way through felting, when it was holding together really well, I needle felted the rest of the design on.
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| Fully felted.  I LOVE the ragged edges. | 
The top layer which was placed as tufts is really textural and interesting.. it looks like lots of wiggly locks felted together.  The longboats are quite wiggly too.. I straightening them up a little with a felting needle as I went along. 
The elements that I needlefelted on stayed in place fairly well.. wherever the wiggly locks tried to distort them I just used a felting needle to tidy them up.
 
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Holding it up to the light shows the texture off well.. you could make amazing lanterns with this!  It glows! | 
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For comparison to sampling data:
Layout size:  63" x 18"
Finished size: 45.5" x 16"
 
Shrinkage: 27.5% x 11%
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I wanted the second piece to be closer to the thickness of the sample piece..  
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| I used saddle fibre in white and toffee brown, carded into batts. | 
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I broke the batts along their length and pulled tufts as I would with tops/roving. After laying down the first layer I added locks with their butt ends brushed all around the outside.. sandwiching the butts in between the first and second layers.. I used three layers. | 
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| After wetting down I 'drew' on the boats | 
 
It's worth mentioning that I find with alpaca it's best not to spend much time rubbing. Rubbing as much as I would with wool seams to make the finished alpaca felts surface hairy - which is a pain if there's a design on there.  I rub it just enough to make sure it is thoroughly wet, then roll it up, tie it, and start rolling.  
Again once the felt was holding together well I needle felted in the rest of the design.. then finished felting.
For comparison to sampling data:
Layout size: 29" x 20"
Finished size: 22" x 15"
Shrinkage: 24% x 25%
Weight: 130g
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Last summers seamless alpaca hat!  Using creamy white and oatmeal tops/roving | 
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| I love old buttons :) | 
I find alpaca felts quickly and evenly, into a firm felt which is soft to touch. I'll definitely be using more of it in the future.  I just wish it didn't take me so long to prepare!  Maybe I'll get faster with practice.  Using tops/roving would be more fun.. no prep and no major clean-up operation afterwards (which I always do when using raw fibre).